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We present the results of precious metals leaching from stubborn sulphidic silver-and- gold-containing ore of Kazakhstani deposit Kunisty by complex cyanide −thiosulphate solutions in comparison with separate cyanide and thiosulphate solutions in the model and experimental conditions. It is establis hed, that in a range of investigated concentrations 0,03 - 0,1 M, application of complex cyanide −thiosulphate solutions leads to change of oxidation-reduction potential of the solutions by 50÷200 mV. The degree of lea...